Note 6 - Intangible Assets (Details Textual) - USD ($) |
3 Months Ended | 9 Months Ended | |||
|---|---|---|---|---|---|
Jun. 30, 2025 |
Jun. 30, 2024 |
Jun. 30, 2025 |
Jun. 30, 2024 |
Sep. 30, 2024 |
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| Amortization of Intangible Assets | $ 500,000 | $ 900,000 | $ 2,200,000 | $ 3,500,000 | |
| Impairment of Intangible Assets (Excluding Goodwill) | 326,173 | 0 | 12,332,625 | 73,447,067 | |
| Goodwill, Impairment Loss | 0 | 0 | 0 | 28,846,832 | |
| Goodwill | 0 | 0 | $ 0 | ||
| Bollinger Motors Segment [Member] | |||||
| Impairment of Intangible Assets (Excluding Goodwill) | $ 300,000 | $ 0 | $ 12,300,000 | 73,500,000 | |
| Goodwill, Impairment Loss | 28,900,000 | ||||
| Bollinger Commercial Segment [Member] | |||||
| Impairment of Intangible Assets (Excluding Goodwill) | $ 15,100,000 | ||||
| Weighted Average [Member] | |||||
| Finite-Lived Intangible Asset, Useful Life (Year) | 7 years 3 months 18 days | 7 years 3 months 18 days | |||
| X | ||||||||||
- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Definition Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. No definition available.
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| X | ||||||||||
- Definition Amount, after accumulated impairment loss, of asset representing future economic benefit arising from other asset acquired in business combination or from joint venture formation or both, that is not individually identified and separately recognized. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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| X | ||||||||||
- Definition Amount of impairment loss from asset representing future economic benefit arising from other asset acquired in business combination or from joint venture formation or both, that is not individually identified and separately recognized. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Definition The amount of impairment loss recognized in the period resulting from the write-down of the carrying amount of an intangible asset (excluding goodwill) to fair value. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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